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General Description

The MAX7401/MAX7405 8th-order, lowpass, Bessel, switched-capacitor filters (SCFs) operate from a single +5V (MAX7401) or +3V (MAX7405) supply. These devices draw only 2mA of supply current and allow corner frequencies from 1Hz to 5kHz, making them ideal for low-power post-DAC filtering and anti-aliasing applications. They feature a shutdown mode that reduces supply current to 0.2μA.

Two clocking options are available on these devices: self-clocking (through the use of an external capacitor) or external clocking for tighter corner-frequency control. An offset adjust pin allows for adjustment of the DC output level.

The MAX7401/MAX7405 Bessel filters provide low over shoot and fast settling. Their fixed response simplifies the design task to selecting a clock frequency.

Features

? 8th-Order, Lowpass Bessel Filters

? Low Noise and Distortion: -82dB THD + Noise

? Clock-Tunable Corner Frequency (1Hz to 5kHz)

? 100:1 Clock-to-Corner Ratio

? Single-Supply Operation

?? +5V (MAX7401)

?? +3V (MAX7405)

? Low Power

?? 2mA (Operating Mode)

?? 0.2μA (Shutdown Mode)

? Available in 8-Pin SO/DIP Packages

? Low Output Offset: ±5mV

Applications

?? ADC Anti-Aliasing

?? CT2 Base Stations

?? Post-DAC Filtering

?? Speech Processing

?? Air-Bag Electronics